Importance

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Abstract

The technique of the present invention improves the picture quality of resulting prints, which are subjected to special effects like halftoning, in an ink jet printer. With regard to two specific colors, light cyan and light magenta, among six colors, cyan, light cyan, magenta, light magenta, yellow, and black, the technique corrects image data having tone values in a predetermined range with regard to each color with noise data simulating a halftone dot pattern, and carries out a dot distributed-type halftoning process, for example, according to the error diffusion method to print an image. Namely the technique provides image data corresponding to a resulting image subjected to special effects like halftoning, and carries out the halftoning process for the image data to implement printing. This arrangement attains the high-quality halftone printing.

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First Claim